I had this happen to me a few years ago. I had to remove my .config and .gnome2 folder from my /home
I suggest backing up your existing .config folder first to somewhere safe, then try logging in.
If that does not resolve the issue, then put it back into /home and try some other solution._________________Whatever you do, do it properly!

i remove the fallback flag in make.conf. To make gnome working
I tink gnome panic to fast . after that gnome works normal_________________----------------------------
Dell System XPS L702X/0XN71K,Intel(R) Core(TM) i7-2720QM